Abstract: Method for transmitting a radio signal between a moving electronics unit of a wheel and a fixed central electronic control unit of the vehicle, includes: defining an angular reference point of the wheel; defining a division of one wheel revolution into successive basic sectors, and transmitting successive radio signals between the two units so that each signal is transmitted at a calculated predetermined wheel angular position; calculating the angular rotation speed of the wheel; determining a minimum wheel rotation sector required for the transmission time of a signal between the two units, at the calculated angular rotation speed; determining an angular offset of transmission between a first and a second following signal, with respect to the angular reference point, as being equal to the smallest multiple of the basic division sector which covers the time required for transmission of the first radio signal at the calculated angular rotation speed.

Abstract: A magnetic induction charging device (50) includes an electrical power supply source (60) connected to a main coil (61). The device (50) includes passive resonant circuits (70, 80, 90, 100) of different respective resonant frequencies in a range of predetermined main frequency values. Each passive resonant circuit (70, 80, 90, 100) includes a secondary coil (71, 81, 91, 101). The secondary coils (71, 81, 91, 101) are arranged in respective different zones of the main coil (61). The electrical power supply source (60) is adapted to generate different charging signals of main frequencies in the range of predetermined main frequency values.

Abstract: A low-frequency emission electronic unit (20?) includes two low-frequency antennas (B1, B2). The second antenna (B2) is passive and resonant, oriented along the main axis (Y) of the first low-frequency antenna (B1) and is adapted to generate two low-frequency fields (D2, D2?) at right angles to the field (D1) emitted by the first antenna (B1). The low-frequency emission electronic unit (20?) makes it possible to reduce the zones of rupture of reception of the low-frequency signals by the wheel unit (13) situated in proximity in which the low-frequency signals emitted by the low-frequency emission electronic unit are not received by the closest wheel unit (13). A low-frequency signal transmission method alternating the emissions of waves by the two antennas (B1, B2) is also described.

Abstract: A communication antenna device (D), on board a motor vehicle, for communicating with an antenna of a portable device, includes: a communication antenna (A) including a first part (A1) having a maximum number of primary windings (E1MAX) and a second part (A2) having a maximum number of secondary windings (E2MAX), a microcontroller (10) electrically connected to the antenna (A), a first switching element (M1), for connecting the first part and/or the second part to the microcontroller (10), a second switching element (M2), for connecting a determined number of primary windings (E1i) of the first part to the microcontroller (10), a third switching element (M3), for connecting a determined number of secondary windings (E2j) of the second part to the microcontroller (10), and elements for controlling (20) the first, second and third switching elements.

Abstract: A method for localization the position of wheels of a vehicle includes: storing, for each wheel, an image of the intensity of the signal originating from an electronic module fitted to the wheel; controlling the emission by each electronic module of a sequence of n signals emitted with predetermined time intervals; computing for each sequence of n signals, the temporal variation of the correlation coefficients between each signal of the sequence and each of the stored images; computing the peak of correlation of the correlation coefficients of each of the n signals and the temporal position over a wheel revolution of each of the n peaks of correlation; and selecting, for each stored image, the wheel at the origin of the emission of sequences having the highest peaks of correlation associated with time intervals corresponding to the time intervals of emission of the n signals of the sequences.

Abstract: A device (20) for charging a portable element (10) having a receiving antenna (Ar) for charging by induction, the charging device (20) includes: a charging surface (Sc); a plurality of emitting antennas (A1, A3); a layer of ferromagnetic material (30) placed beneath the plurality of emitting antennas (A1, A3); an electronic circuit; a plurality of resonators (R1, R2 . . . Ri): having a resonance frequency substantially equal to the emission frequency of the antennas, placed between the plurality of antennas and the charging surface, and suitable, when they are activated, for reflecting the magnetic field (B) emitted by the antennas, and connected to the electronic circuit in order to be deactivated individually, according to a criterion of positioning of the receiving antenna relative to the resonators. An associated charging method is also described.

Abstract: An inductive charging device (20) for a portable apparatus for an automobile vehicle including at least one charging antenna (70) for inductive charging of the WPC type having a cut-out at its center (62) together with one communication antenna (60) for near-field communication of the NFC type, situated around the at least one charging antenna, along the sides of the charging device (Z1, Z2, Z3, Z4) and including at least one winding, the device being such that: on at least one of the sides of the charging device, the communication antenna forms at least one loop (B) having at least one crossing point (61) on its base, the communication antenna having at least an upper part (63) surrounding the center of the cut-out of the charging antenna, the upper part of the loop of the communication antenna surrounding the center of the cut-out has at least one winding.

Abstract: A method for characterizing, by way of at least one primary antenna (13, 31) on board a motor vehicle (10), a mobile device (20) of indeterminate type comprising a secondary antenna (21) of indeterminate size, approaching said motor vehicle (10) in an indeterminate approach mode, said primary antenna (13, 31) being intended to communicate with the secondary antenna (21) of the mobile device (20), and generating a voltage (V) across its terminals, the voltage being linked to an on-board system (11) of the motor vehicle (10), the invention proposes that the method of characterization comprises the following steps: step 1: measurement by the on-board system (11) of the voltage across the terminals of the primary antenna (13, 31), over a series of predetermined time periods, step 2: computation of a voltage difference for each predetermined time period, step 3: comparison of the voltage difference with a value previously stored in the memory, step 4: if the voltage difference is positive, then the mobile devic

Abstract: A method for locating the position of the wheels of a vehicle, each wheel being equipped with a sensor capable of emitting a location signal and the vehicle being equipped with a receiver capable of receiving the location signals emitted by the sensors. The method includes the step of determining a signature of the location signal emitted by the sensor of each wheel as a function of the position of the wheel on the vehicle, and the step of storing in the receiver the signature and the corresponding position of each of the wheels. The receiver is equipped with at two least two antennas, called first and second antennas, the signature of the location signal emitted by the sensor of each wheel being determined from the strength difference between the strength of the signal received by the first antenna and the strength of the signal received by the second antenna.

Abstract: A device (10) for charging a mobile terminal by magnetic coupling, includes a first charging module (11) designed to form a charging signal at a first charging frequency, a primary coil (13) composed of a set of turns, a ferromagnetic body (14), a second charging module (12) designed to form a charging signal at a second charging frequency, higher than the first charging frequency. Furthermore, the charging device includes first routing elements (150) designed to connect/disconnect the primary coil (13) to/from the first charging module (11) and to/from the second charging module (12), elements (16) for adjusting the number of turns on the primary coil (13) and elements (19) for saturating the ferromagnetic body (14) at the second charging frequency. A charging method is also described.

Abstract: A detection and near-field communication device for detecting the approach of a portable device integrating a near-field communication antenna for communicating with the portable device, includes: a printed circuit including: an upper face oriented toward the portable device and a lower face, a microcontroller, a near-field reader, a detection module, a near-field communication antenna, situated on a face of the printed circuit having a first surface and being linked to the near-field reader; a plurality of resonators made of copper wire windings, printed on a face of the printed circuit, covering a surface substantially identical to the first surface; the resonators including frequency adjustment elements so as to resonate at the near-field communication frequency; and the resonators generating a voltage variation across their terminals and being connected to the detection module to detect the approach of the portable device.

Abstract: A method for characterizing, via at least one primary antenna on board a motor vehicle, a mobile device including a secondary antenna, approaching the vehicle in an indeterminate approach mode, the primary antenna intended to communicate with the secondary antenna, and generating a voltage across its terminals, the voltage being linked to an on-board system, includes: measuring the voltage of the primary antenna over a series of predetermined time periods, computing a voltage difference for each predetermined time period, comparing the voltage difference with a previously stored value, if the voltage difference is positive, the mobile device is of dielectric type, if it is negative, it is of metallic type, if the voltage difference is zero over a predetermined time period above a threshold, the mobile device is in static approach mode, otherwise it is in dynamic approach mode.

Abstract: A communication antenna device (D), on board a motor vehicle, for communicating with an antenna of a portable device, includes: a communication antenna (A) including a first part (A1) having a maximum number of primary windings (E1MAX) and a second part (A2) having a maximum number of secondary windings (E2MAX), a microcontroller (10) electrically connected to the antenna (A), a first switching element (M1), for connecting the first part and/or the second part to the microcontroller (10), a second switching element (M2), for connecting a determined number of primary windings (E1i) of the first part to the microcontroller (10), a third switching element (M3), for connecting a determined number of secondary windings (E2j) of the second part to the microcontroller (10), and elements for controlling (20) the first, second and third switching elements.

Abstract: A device (20) for charging a portable element (10) having a receiving antenna (Ar) for charging by induction, the charging device (20) includes: a charging surface (Sc); a plurality of emitting antennas (A1, A3); a layer of ferromagnetic material (30) placed beneath the plurality of emitting antennas (A1, A3); an electronic circuit; a plurality of resonators (R1, R2 . . . Ri): having a resonance frequency substantially equal to the emission frequency of the antennas, placed between the plurality of antennas and the charging surface, and suitable, when they are activated, for reflecting the magnetic field (B) emitted by the antennas, and connected to the electronic circuit in order to be deactivated individually, according to a criterion of positioning of the receiving antenna relative to the resonators.

Abstract: A charging bench includes three coils that partially overlap, in superposed planes. An electrical feed makes it possible to supply the coils with an AC current from the mains. A portable device to be charged is placed on the upper side of this charging bench. This device includes a winding intended to receive the electrical charging, and a ferrite protective screen. One of the coils (Bb) is selected to emit the magnetic charging flux toward the mobile phone. The selection is carried out via the emission of a series of pulses by at least one of the coils and comparison of return signals with a reference threshold. This comparison also enables one of the other coils (Ba, Bc) to be selected or both of these other two coils (Ba, Bc) to be used to receive a flux for communicating information originating from the portable device to be charged.

Abstract: A detection and near-field communication device for detecting the approach of a portable device integrating a near-field communication antenna for communicating with the portable device, includes: a printed circuit including: an upper face oriented toward the portable device and a lower face, a microcontroller, a near-field reader, a detection module, a near-field communication antenna, situated on a face of the printed circuit having a first surface and being linked to the near-field reader; a plurality of resonators made of copper wire windings, printed on a face of the printed circuit, covering a surface substantially identical to the first surface; the resonators including frequency adjustment elements so as to resonate at the near-field communication frequency; and the resonators generating a voltage variation across their terminals and being connected to the detection module to detect the approach of the portable device.

Abstract: An inductive charging device (20) for a portable apparatus for an automobile vehicle including at least one charging antenna (70) for inductive charging of the WPC type having a cut-out at its center (62) together with one communication antenna (60) for near-field communication of the NFC type, situated around the at least one charging antenna, along the sides of the charging device (Z1, Z2, Z3, Z4) and including at least one winding, the device being such that: on at least one of the sides of the charging device, the communication antenna forms at least one loop (B) having at least one crossing point (61) on its base, the communication antenna having at least an upper part (63) surrounding the center of the cut-out of the charging antenna, the upper part of the loop of the communication antenna surrounding the center of the cut-out has at least one winding.

Abstract: A method for locating the position of the wheels of a vehicle, each wheel being equipped with a sensor capable of emitting a location signal and the vehicle being equipped with a receiver capable of receiving the location signals emitted by the sensors. The method includes the step of determining a signature of the location signal emitted by the sensor of each wheel as a function of the position of the wheel on the vehicle, and the step of storing in the receiver the signature and the corresponding position of each of the wheels. The receiver is equipped with at two least two antennas, called first and second antennas, the signature of the location signal emitted by the sensor of each wheel being determined from the strength difference between the strength of the signal received by the first antenna and the strength of the signal received by the second antenna.

Abstract: A method for localization the position of wheels of a vehicle includes: storing, for each wheel, an image of the intensity of the signal originating from an electronic module fitted to the wheel; controlling the emission by each electronic module of a sequence of n signals emitted with predetermined time intervals; computing for each sequence of n signals, the temporal variation of the correlation coefficients between each signal of the sequence and each of the stored images; computing the peak of correlation of the correlation coefficients of each of the n signals and the temporal position over a wheel revolution of each of the n peaks of correlation; and selecting, for each stored image, the wheel at the origin of the emission of sequences having the highest peaks of correlation associated with time intervals corresponding to the time intervals of emission of the n signals of the sequences.